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Synchronize audio and video with FFmpeg - Geeky Hacker
https://www.geekyhacker.com/2020/05/17/synchronize-audio-and-video-with-ffmpeg/#:~:text=1%20-i%20%E2%80%93%20stands%20for%20input.%20...%202,except%20for%20the%20video%20codec.%20More%20items...%20
FFmpeg Devices Documentation
https://ffmpeg.org/ffmpeg-devices.html
Audio-CD input device based on libcdio. To enable this input device during configuration you need libcdio installed on your system. It requires the configure option --enable-libcdio. This device allows playing and grabbing from an Audio-CD. For example to copy with ffmpeg the entire Audio-CD in /dev/sr0, you may run the command:
ffmpeg Documentation
https://ffmpeg.org/ffmpeg.html
As an input option, blocks all audio streams of a file from being filtered or being automatically selected or mapped for any output. See -discard option to disable streams individually. As an output option, disables audio recording i.e. automatic selection or mapping of any audio stream. For full manual control see the -map option. -acodec codec (input/output) …
audio types – FFmpeg
https://trac.ffmpeg.org/wiki/audio%20types
Reading and Writing Raw Audio. FFmpeg can take input of raw audio types by specifying the type on the command line. For instance, to convert a "raw" audio type to a ".wav" file: ffmpeg -f s32le input_filename.raw output.wav You can specify number of channels, etc. as well, ex: ffmpeg -f u16le -ar 44100 -ac 1 -i input.raw output.wav
How to check audio / video file information in FFmpeg ...
http://johnriselvato.com/how-to-check-audio-video-file-information-in-ffmpeg/
$ ffmpeg -i input.mp3 ffmpeg version 4.2.2 Copyright (c) 2000-2019 the FFmpeg developers built with Apple clang version 11.0.0 (clang-1100.0.33.17) configuration: --prefix=/usr/local/Cellar/ffmpeg/4.2.2_2 --enable-shared --enable-pthreads --enable-version3 --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-gnutls - …
My Command Line Audio Video Workflows with FFmpeg
https://ahmadawais.com/ffmpeg-command-line-audio-video-workflows/
Extract audio stream from video without re-encoding# ffmpeg -i input-video.avi -vn -acodec copy output-audio.aac-vn is no video.-acodec copy use the same audio stream that’s already in there. Rotate a video with FFmpeg# # Rotate 90 clockwise: ffmpeg -i in.mov -vf "transpose=1" out.mov. For the transpose parameter you can pass:
Pipe input in to ffmpeg stdin - Stack Overflow
https://stackoverflow.com/questions/45899585/pipe-input-in-to-ffmpeg-stdin
ffmpeg has a special pipe flag that instructs the program to consume stdin. note that almost always the input format needs to be defined explicitly. example (output is in PCM signed 16-bit little-endian format): cat file.mp3 | ffmpeg -f mp3 -i pipe: -c:a pcm_s16le -f s16le pipe: pipe docs are here supported audio types are here
How to record system sound with FFMPEG on Windows 10
https://www.addictivetips.com/windows-tips/record-system-sound-with-ffmpeg-on-windows-10/
ffmpeg -f dshow -i audio="Stereo Mix (Realtek Audio)" C:\Users\fatiw\Desktop\Audio\output.mp3. The recording will begin right away. You can minimize the Command Prompt window if you like but do not close it. When you want to stop the recording, return to the Command Prompt window and tap the Ctrl+C keyboard shortcut.
ffmpeg - How to specify audio and video bitrate - Super User
https://superuser.com/questions/319542/how-to-specify-audio-and-video-bitrate
In order to specify the target bitrate for video and audio, use the -b:v and -b:a options, respectively. You can use abbreviations like K for kBit/s and M for MBit/s. For example: ffmpeg -i input.mp4 -b:v 1M -b:a 192k output.avi Note: This is a simple one-pass encode that tries to reach the specified bitrate at the end.
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